2157475531 has 2 divisors, whose sum is σ = 2157475532. Its totient is φ = 2157475530.

The previous prime is 2157475501. The next prime is 2157475547. The reversal of 2157475531 is 1355747512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2157475531 - 2¹³ = 2157467339 is a prime.

It is a super-2 number, since 2×2157475531² = 9309401333727463922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2157475501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078737765 + 1078737766.

It is an arithmetic number, because the mean of its divisors is an integer number (1078737766).

Almost surely, 2^2157475531 is an apocalyptic number.

2157475531 is a deficient number, since it is larger than the sum of its proper divisors (1).

2157475531 is an equidigital number, since it uses as much as digits as its factorization.

2157475531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 147000, while the sum is 40.

The square root of 2157475531 is about 46448.6332522282. The cubic root of 2157475531 is about 1292.1570247779.

The spelling of 2157475531 in words is "two billion, one hundred fifty-seven million, four hundred seventy-five thousand, five hundred thirty-one".